docs: Update openapi.yml

[spoo-bar]

The swagger docs for the REST endpoints have not been updated in a long while, with multiple endpoints missing.
This PR updates the openapi.yml to the latest queries available

[the-frey]

Thanks! Can't say it's something I regularly use so probably why it wasn't spotted 🤔

[giansalex]

In this page https://v1.cosmos.network/rpc/v0.45.1, we can set a custom API URL

so it is not necessary to have it in this repo

[spoo-bar]

@giansalex Currently multiple Juno node providers do have a swagger page for their REST endpoints.

1. LavenderFive https://juno-api.lavenderfive.com/
2. Notional https://api-juno-ia.cosmosia.notional.ventures/
3. Silknodes https://api.juno.silknodes.io/

They seem to be taking the openapi spec from the repo. This results in them showing old endpoints.

Additionally, the https://v1.cosmos.network/rpc/v0.45.1 link does not seem to support the endpoints exposed by x/wasmd under /cosmwasm/wasm/v1/

I think it might still be useful to have the updated spec in the repo to ensure up-to-date documentation by node providers.

[giansalex]

REST endpoint is from the juno node, if we delete file here, it will not be shown there.

[faddat]

Thank you Spoorthi!

This is great

[the-frey]

As far as I can tell the swagger on live nodes does match the repo, so needs updating? On that basis LGTM